Ungrateful : অকৃতজ্ঞ;
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Appropriate Prepositions
Abide by(মেনে চলা): We must abide by the rules of discipline.
Charge with(অভিযুক্ত করা): He is charged with killing.
Conform to (নিয়মনীতি অনুসরণ করা): The employees have to conform to a strict dress code.
Run over (চাপা পড়া): The man was run over by a truck.
Taste for (রুচি; পছন্দ): He has a great taste for music.
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Idioms
At a standstill (নিশ্চল, অচলাবস্থায়-adj.) The discussion is now at a standstill.
Bad book (disfavour-খারাপ নজর —n) The secretary has fallen in the bad book of the manager.
Fight shy (এড়িয়ে চলা): Why do you fight shy of your teacher?
To play on a fiddle (অনর্থক সময় নষ্ট করা - To waste time)-He played on a fiddle by nature.
With a view to (উদ্দেশ্য)- He goes to college with a view to attending the class.